The morning rush could be treacherous for commuters in three New Jersey counties Wednesday morning as freezing rain and black ice are possible, though much warmer weather is on the way.

The National Weather Service has issued a winter weather advisory for Sussex, Warren and western Passaic counties until 8 a.m., saying a light glaze of ice could also accumulate. Slippery conditions on roads, sidewalks and bridges could result.

Dozens of schools in the northwestern part New Jersey announced delayed openings.

As of 6:30 a.m., temperatures across the state range from 25 at the High Point Monument to 36 in Atlantic City, Sea Girt and Downe Township, the state climatologist’s office said. Most locations are in the low 30s, though.

Later this morning, skies will gradually become partly sunny across the state with afternoon highs climbing into the mid 40s to the low 50s. Temperatures are expected to reach 47 in Atlantic City, 50 in Newark and 51 in Trenton.

Light and patchy fog are a threat during the overnight hours as temps fall into the upper 30s and low 40s.

See rain totals for weekend soaking

Thursday and Friday will be quite mild — with temperatures making into the mid to low 60s across the state. While it will be dry during the day Thursday, rain is expected to roll in at night and continue into Friday.

While highs will be about 20 degrees above normal, no records are in jeopardy.

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Jeff Goldman may be reached at jeff_goldman@njadvancemedia.com. Follow him on Twitter @JeffSGoldman. Find NJ.com on Facebook.